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What have we found out about the Oort cloud?

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The Oort Cloud is believed to be a thick bubble of icy debris that surrounds our solar system. ... They also found that long-period comets are on average up to twice as large as "Jupiter family comets," whose orbits are shaped by Jupiter's gravity and have periods of less than 20 years. read more

The Oort Cloud is an extended shell of icy objects that exist in the outermost reaches of the solar system. read more

This object, known as Nemesis, was hypothesized to pass through a portion of the Oort cloud approximately every 26 million years, bombarding the inner Solar System with comets. However, to date no evidence of Nemesis or the Oort cloud have been found, and many lines of evidence (such as crater counts), have thrown their existence into doubt. read more

8. Two dwarf planet-like objects have been discovered there. Objects of around 450 kilometres (280 miles) in diameter have been discovered in the Oort Cloud within the last ten years. One of them, Sedna, has an extreme orbital period of 11,400 years that takes it from around 76 AU to 1,000 AU away from the Sun. 0. read more

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New dwarf planet found sneaking through the inner Oort ...
Source: arstechnica.com

Further Research

Oort Cloud Facts
space-facts.com

What is the Oort Cloud?
www.universetoday.com

Where Do Comets Come From?
rosetta.jpl.nasa.gov